The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/random.h

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    1 /*
    2  * random.h -- A strong random number generator
    3  *
    4  * $FreeBSD: stable/4/sys/sys/random.h 103496 2002-09-17 17:11:57Z sam $
    5  *
    6  * Version 0.95, last modified 18-Oct-95
    7  * 
    8  * Copyright Theodore Ts'o, 1994, 1995.  All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, and the entire permission notice in its entirety,
   15  *    including the disclaimer of warranties.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The name of the author may not be used to endorse or promote
   20  *    products derived from this software without specific prior
   21  *    written permission.
   22  * 
   23  * ALTERNATIVELY, this product may be distributed under the terms of
   24  * the GNU Public License, in which case the provisions of the GPL are
   25  * required INSTEAD OF the above restrictions.  (This clause is
   26  * necessary due to a potential bad interaction between the GPL and
   27  * the restrictions contained in a BSD-style copyright.)
   28  * 
   29  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
   30  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   31  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   32  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   39  * OF THE POSSIBILITY OF SUCH DAMAGE.
   40  *
   41  */
   42 
   43 /*
   44  * Many kernel routines will have a use for good random numbers,
   45  * for example, for truely random TCP sequence numbers, which prevent
   46  * certain forms of TCP spoofing attacks.
   47  * 
   48  */
   49 
   50 #ifndef _SYS_RANDOM_H_
   51 #define _SYS_RANDOM_H_
   52 
   53 #include <sys/ioccom.h>
   54 
   55 #define MEM_SETIRQ      _IOW('r', 1, u_int16_t) /* set interrupt */
   56 #define MEM_CLEARIRQ    _IOW('r', 2, u_int16_t) /* clear interrupt */
   57 #define MEM_RETURNIRQ   _IOR('r', 3, u_int16_t) /* return interrupt */
   58 
   59 #ifdef _KERNEL
   60 
   61 /* Type of the cookie passed to add_interrupt_randomness. */
   62 
   63 struct random_softc {
   64         inthand2_t      *sc_handler;
   65         void            *sc_arg;
   66         int             sc_intr;
   67 };
   68 
   69 /* Exported functions */
   70 
   71 void rand_initialize(void);
   72 void add_keyboard_randomness(u_char scancode);
   73 inthand2_t add_interrupt_randomness;
   74 #ifdef notused
   75 void add_blkdev_randomness(int major);
   76 #endif
   77 void add_true_randomness(int);
   78 
   79 #ifdef notused
   80 void get_random_bytes(void *buf, u_int nbytes);
   81 #endif
   82 u_int read_random(void *buf, u_int size);
   83 u_int read_random_unlimited(void *buf, u_int size);
   84 #ifdef notused
   85 u_int write_random(const char *buf, u_int nbytes);
   86 #endif
   87 struct proc;
   88 int random_poll(dev_t dev, int events, struct proc *p);
   89 
   90 #endif /* _KERNEL */
   91 
   92 #endif /* !_SYS_RANDOM_H_ */

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